Routes › Chicago (ORD) › ORD to BZN
Route · 12 months to July 2026
Chicago to Bozeman: on-time record
Chicago O'Hare International to Bozeman Yellowstone International
BTS: A flight is counted as on time if it arrived less than 15 minutes after its scheduled time. Only carriers with at least 0.5 percent of domestic scheduled passenger revenue report. Data through July 2026; this is a monthly history, not live flight status.
Flights from Chicago (ORD) to Bozeman (BZN) arrived on time 68.1% of the time in the 12 months to July 2026. Reporting carriers scheduled 1,268 flights on the route in that period, about 4 a day, a distance of 1,185 miles.
That is 7.9 points below the national on-time share of 76.0% for the same period and 1.3 points below the 69.4% recorded for all departures from ORD. Flights that did arrive were 15.3 min late on average, and 0.8% of scheduled flights were cancelled (national: 1.8%).
3 reporting carriers flew the route at least 60 times. United Airlines had the highest on-time share at 71.3% of 689 flights; American Airlines had the lowest at 64.4% of 469.
By scheduled departure hour (local time at ORD), flights leaving from 9 am to 10 am had the highest on-time share, 78.6%; those leaving from 7 pm to 8 pm had the lowest, 45.4%.
The on-time share is down 5.9 points on the previous 12 months (74.0%); cancellations moved from 0.5% to 0.8%.
Of the delay minutes that carriers assigned to a BTS cause category on this route, late-arriving aircraft 44%, national aviation system 25% and air carrier 24%.
- On time 68.1%
- Arrived 15+ minutes late 30.5%
- Cancelled 0.8%
- Diverted 0.6%
Airlines on the route compared
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| UA United Airlines | 689 | 54% | 71.3% | 14.6 min | 1.0% |
| AA American Airlines | 469 | 37% | 64.4% | 17.3 min | 0.6% |
| OO SkyWest Airlines | 69 | 5% | 71.0% | 10.5 min | 0.0% |
| MQ Envoy Air | 41 | 3% | 53.7% | 10.1 min | 0.0% |
Carriers with at least 24 flights in the 12 months to July 2026. The on-time pill is green when a carrier is at or above the route's overall share. Regional carriers operate flights sold under larger airlines' brands; BTS lists the carrier that operated the flight.
Compared with the airports and the nation
| Measure | ORD to BZN | All departures from ORD | All arrivals at BZN | All reported flights |
|---|---|---|---|---|
| Arrived on time | 68.1% | 69.4% | 78.0% | 76.0% |
| Arrived 15+ minutes late | 30.5% | 27.5% | 20.9% | 21.9% |
| Cancelled | 0.8% | 2.8% | 0.7% | 1.8% |
| Diverted | 0.6% | 0.3% | 0.4% | 0.3% |
| Average arrival delay | 15.3 min | 15.0 min | 5.3 min | 8.1 min |
| Delay minutes per 100 flights | 2,119 | 2,252 | 1,280 | 1,684 |
| Scheduled flights | 1,268 | 359,911 | 11,804 | 7,043,858 |
12 months to July 2026. Delay minutes count late arrivals only (an early arrival is zero), so the per-100-flights row is a normalised total rather than an average of early and late.
The return direction, BZN to ORD, recorded 72.2% on time across 1,267 flights in the same period.
Month by month
Year on year: on time 68.1% against 74.0% (−5.9 pts), cancelled 0.8% against 0.5%, flights 1,268 against 996.
By scheduled departure hour
Delay causes
Seasonality
| Calendar month | Flights | On time | Cancelled | Avg arrival delay | Years in sample |
|---|---|---|---|---|---|
| Jan | 258 | 63.2% | 1.2% | 18.8 min | 3 |
| Feb | 230 | 76.5% | 0.0% | 5.6 min | 3 |
| Mar | 282 | 67.4% | 0.7% | 18.0 min | 3 |
| Apr | 123 | 79.7% | 1.6% | 5.0 min | 3 |
| May | 225 | 80.4% | 0.0% | 3.3 min | 3 |
| Jun | 362 | 72.9% | 0.0% | 15.2 min | 3 |
| Jul | 379 | 64.1% | 1.6% | 14.5 min | 3 |
| Aug | 302 | 70.5% | 1.7% | 10.0 min | 3 |
| Sep | 308 | 84.7% | 0.0% | 0.1 min | 3 |
| Oct | 262 | 75.2% | 0.0% | 4.2 min | 3 |
| Nov | 73 | 87.7% | 0.0% | -1.3 min | 3 |
| Dec | 223 | 71.3% | 0.4% | 10.5 min | 3 |
Each calendar month summed across the 36 months on file, so most rows combine three years. The pill compares the month with the route's own 12-month share.
Other routes from Chicago (ORD)
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| ORD–LGA | Chicago to New York | 11,611 | 63.5% | 19.6 min | 5.1% |
| ORD–BOS | Chicago to Boston | 7,755 | 65.6% | 18.3 min | 3.0% |
| ORD–DCA | Chicago to Washington | 7,042 | 67.5% | 17.5 min | 3.0% |
| ORD–LAX | Chicago to Los Angeles | 7,023 | 71.9% | 12.5 min | 1.4% |
| ORD–DFW | Chicago to Dallas/Fort Worth | 6,997 | 67.8% | 17.2 min | 2.9% |
| ORD–ATL | Chicago to Atlanta | 6,442 | 73.4% | 11.2 min | 2.3% |
| ORD–MSP | Chicago to Minneapolis | 6,344 | 68.3% | 17.8 min | 2.6% |
| ORD–MCO | Chicago to Orlando | 6,272 | 71.4% | 12.8 min | 1.6% |
All 193 routes and the airport record for ORD · airport record for BZN
Questions and answers
How often are flights from Chicago to Bozeman on time?
68.1% of the 1,268 flights scheduled from ORD to BZN in the 12 months to July 2026 arrived less than 15 minutes after their scheduled time. The national share for the same period was 76.0%. Cancelled and diverted flights count as not on time.
Which airline has the highest on-time share from ORD to BZN?
Among reporting carriers with at least 60 flights on the route, United Airlines had the highest on-time share (71.3%), followed by SkyWest Airlines (71.0%) and American Airlines (64.4%). Differences of a point or two on a few hundred flights are small.
What causes delays between Chicago and Bozeman?
For flights that arrived 15 or more minutes late, carriers attributed the delay minutes as follows: late-arriving aircraft 44%, national aviation system 25%, air carrier 24%, extreme weather 7%, security 0%. The categories are the carriers' own reports to BTS; weather that slows the wider system is usually recorded under the National Aviation System rather than extreme weather.
What time of day has the highest on-time share from ORD?
Flights scheduled to leave ORD from 9 am to 10 am arrived on time 78.6% of the time, the highest of any hour with enough flights to compare. The lowest was 7 pm to 8 pm at 45.4%. Delays tend to build through the day as late aircraft carry over to later flights.
Is it getting better?
The on-time share for the 12 months to July 2026 was 68.1%, down 5.9 points on the previous 12 months (74.0%). The monthly chart on this page shows each of the last 36 months. Across those months, November had the highest on-time share (87.7%) and January the lowest (63.2%).
Where does this data come from?
Every figure is computed from the Bureau of Transportation Statistics Reporting Carrier On-Time Performance files, which list each scheduled domestic flight by the carriers required to report. This page covers August 2023 to July 2026. It shows totals and averages only; it is not a live flight-status service.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance (1987 to present), monthly files August 2023 to July 2026, a US government work in the public domain. Figures are totals and averages over all scheduled flights by reporting carriers on the route; no individual flight or aircraft is identified. Times are local to the departure airport. The load factor and passenger counts from the BTS T-100 series are not included in this edition. See the methodology; report processing errors through corrections.